My 2 cents. Almost every British radio truck and even carriers used a 12 volt electrical system for the wireless completely independent of the 6 volt vehicle system. The 12 volt wireless system included either replacement batteries delivered every morning (along with your rations I presume) or two sets of batteries so one could charge while the other was operating the radio. This arrangement would be modified for setups working away from 'base' as the LRDG did, so a self contained system with a generator is the most likely. Jumper cables to pairs of 6 volt wireless batteries to charge then put in series for 12 volts?? That would be about the only way using the truck generator if a chorehorse wasn't available.
As to the type of radio, it seems 11 sets were first used, but did they ever change over to 19 sets? The electrical system above would have accommodated either.
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